Can end with pivoted bonded seal slide

ABSTRACT

A can end is provided with a pour opening having a pour width. The pour opening is provided with an entry aperture at one end of the pour opening. The entry aperture has a slide width greater than the pour width. The can end has a can end lapping portion and a can end sealing portion adjacent the pour opening and a plane of bulge strength adjacent the entry aperture. A slide is pivoted on the can end, is adapted to pass through the entry aperture and has a slide lapping portion and a slide sealing portion. The slide lapping portion is adapted to register with the can end lapping portion, and the slide sealing portion is adapted to register with the plane of bulge strength. A pull tab has a connection to the slide. The pull tab is connected to the can end by a score line. One member of the pivot and the connection press the can end lapping portion into intimate contact with the slide lapping portion and the slide sealing portion into intimate contact with the plane of bulge strength. A pressure barrier material seals the intimately contacting can end sealing portion and the slide lapping portion and also seals the intimately contacting plane of bulge strength and the slide sealing portion. The pressure barrier material is bonded to the can end sealing portion with a first predetermined shear strength and to the slide lapping portion and to the plane of bulge strength with a second predetermined shear strength less than the first predetermined shear strength. The pull tab has a plane of weakness on one side of the connection to the slide and a pressure portion on the other side of the connection. The pull tab is movable away from the can end about the plane of weakness to cause the pressure portion to break the score line and the bond between the slide lapping portion and the pressure barrier material adjacent the can end sealing portion so that the pressure barrier material adjacent the can end sealing portion now functions as an exit and reclosure slide guide. The pull tab then is movable to cause the slide to break the bond between the pressure barrier material adjacent the plane of bulge strength and the slide sealing portion and to cause the slide to move through the entry aperture on the pressure barrier material adjacent the plane of bulge strength as a guide to uncover the pour opening.

United States Patent [191 Douty [451 Apr. 1-7], 1973 22 Filed:

[ CAN END WITH PIVOTED BONDED SEAL SLIDE [75] Inventor: Donald L. Douty, Franklin Township, Westmoreland County,

73 Assignee: United Statesteel Corporation,

Pittsburgh, Pa.

' Jan. 28,1972

[21] Appl. No.: 221,631

Related US. Application Data [62] Division of Ser. No. 146,945, May 26, 1971, which is a division of Ser. No. 61,384, Aug. 5, 1970, Pat. No.

UNITED STATES PATENTS Then ..222/555 Balocca et al. ..220/53 Primary ExaminerStanley H. Tollberg Attorney--Robert J. Leek, Jr.

[ 5 7] ABSTRACT A can end is provided with a pour opening having a pour width. The pour opening is provided with an entry aperture at one end of the pour opening. The entry aperture has a slide width greater than the pour width. The can end has a can end lapping portion and a can end sealing portion adjacent the pour opening a plane of bulge strength adjace rit the entry aperture. A slide is pivoted on the can end, is adapted to pass through the entry aperture and has a slide lapping portion and a slide sealing portion. The slide lapping portion is adapted to register with the can end lapping portion, and the slide sealing portion is adapted to register with the plane of bulge strength. A pull tab has a connection to the slide. The pull tab is connected to the can end by a score line. One member of the pivot and the connection press the can end lapping portion into intimate contact with the slide lapping portion and the slide sealing portion into intimate contact with the plane of bulge strength. A pressure barrier material seals the intimately contacting can end sealing portion and the slide lapping portion and also seals the intimately contacting plane of bulge strength and the slide sealing portion. The pressure barrier material is bonded to the can end sealing portion with a first predetermined shear strength and to the slide lapping portion and to the plane of bulge strength with a second predetermined shear strength less than the first predetermined shear strength. The pull tab has a plane of weakness on one side of the connection to the slide and a pressure portion on the other side of the connection. The pull tab is movable away from the can end about the plane of weakness to cause the pressure portion to break the score line and the bond between the slide lapping portion and the pressure barrier material adjacent the can end sealing portion so that through the entry aperture on the pressure barrier material adjacent the plane of bulge strength as a guide to uncover the pour opening.

45 Claims, 70 Drawing Figures PATENTEI] APR I 7 I975 sum 010E 34 PATENTED PR 1 1 ma SHEU 05 0F 34 PATENIEI] APR 1 71975 SHEET 07 0F 34 PATENTEB APR I 71975 SHEET 08 [1F 34 PATENTED A R 1 1 m3 3'. 727. 810

sum 09 0F 34 Z Y FIG. 80

no FIG. 8E

i an 3 vm mm PATENTED APR 1 7 I973 SHEET 10 HF 34 PATENTED APR 1 7 I973 SHEET 11 [1F 34 ON NN PATENTED APR 1 (I973 SHEET 12 UP 34 PATENTEU APR 1 7197s SHEET 13 0F 34 C FIG. I2A

FIG. I28

FIG. I2C

PATENTEDAPR 1 71973 sum 15 or 3 nmm on 07 non PATENTED APR 1 7 I973 SHEET 18 0F 34 FIG. I3E

PATENTEDAPR 1 (I873 sum 18 [1F 3 FIG. I48

PATENTED APR 1 7 I973 SHEET 19 0F 34 

1. In combination: a. a can end provided with a pour opening having a pour width,
 1. said pour opening being provided with an entry aperture at one end of said pour opening, said entry aperture having a slide width greater than said pour width,
 2. said can end having a can end lapping portion and a can end sealing portion adjacent said pour opening and a plane of bulge strength adjacent said entry aperture, b. a slide pivoted on said can end and adapted to pass through said entry aperture and having a slide lapping portion and a slide sealing portion,
 1. said slide lapping portion being adapted to register with said can end lapping portion, and
 2. said slide sealing portion being adapted to register with said plane of bulge strength, c. a pull tab having a connection to said slide,
 1. said pull tab being connected to said can end by a score line, d. one of said pivot and said connection pressing said can end lapping portion into intimate contact with said slide lapping portion and said slide sealing portion into intimate contact with said plane of bulge strength, e. a pressure barrier material for sealing said intimately contacting can end sealing portion and said slide lapping portion and also for sealing said intimately contacting plane of bulge strength and said slide sealing portion,
 1. said pressure barrier material being bonded to said can end sealing portion with a first predetermined shear strength and to said slide lapping portion and to said plane of bulge strength with a second predetermined shear strength less than said first predetermined shear strength, f. said pull tab having a plane of weakness on one side of said connection to said slide and a pressure portion on the other side of said connection, g. said pull tab being movable away from said can end about said plane of weakness to cause said pressure portion to break said score line and the bond between said slide lapping portion and said pressure barrier material adjacent said can end sealing portion so that said pressure barrier material adjacent said can end sealing portion now functions as an exit and reclosure slide guide; and h. said pull tab then being movable to break the bond between said pressure barrier material adjacent said plane of bulge strength and said slide sealing portion and to cause said slide to move through said entry aperture on said pressure barrier material adjacent said plane of bulge strength as a guide to uncover said pour opening.
 2. said can end having a can end lapping portion and a can end sealing portion adjacent said pour opening and a plane of bulge strength adjacent said entry aperture, b. a slide pivoted on said can end and adapted to pass through said entry aperture and having a slide lapping portion and a slide sealing portion,
 2. said slide sealing portion being adapted to register with said plane of bulge strength, c. a pull tab having a connection to said slide,
 2. The combination recited in claim 1 wherein said entry aperture is a slit.
 3. The combination recited in claim 1 wherein said entry aperture is a slot.
 4. The combination recited in claim 1 wherein said entry aperture is provided with a slide guide means.
 5. The combination recited in claim 1 wherein said slide has a bulge strength measured in lbs./sq. inch equal to or greater than the bulge strength of said can end.
 6. The combination recited in claim 1 wherein said engaging means has a stationary member supporting one member of said pull tab, said slide and said can end and a movable member engaging another member of said pull tab, said slide and said can end.
 7. The combination recited in claim 1 wherein said engaging means is said pull tab engaging said can end lapping portion.
 8. The combination recited in claim 1 wherein said pull tab is integral with said slide.
 9. The combination recited in claim 1 wherein said connection is integral with one of said pull tab and said slide.
 10. The combination recited in claim 1 wherein said connection is separate from either said pull tab or said slide.
 11. The combination recited in claim 1 wherein said connection is a weld.
 12. The combinatiOn recited in claim 1 wherein said connection is an adhesive.
 13. The combination recited in claim 1 wherein said connection is sealed to said slide by said pressure barrier material.
 14. The combination recited in claim 1 wherein said pour opening is radial.
 15. The combination recited in claim 2 wherein said pour opening is chordal.
 16. The combination recited in claim 1 wherein said can end has a pour opening embossment around said pour opening.
 17. The combination recited in claim 16 wherein said embossment is upward.
 18. The combination recited in claim 16 wherein said embossment is downward for vacuum sealing.
 19. The combination recited in claim 1 wherein said slide has a locking tab for engaging said can end.
 20. The combination recited in claim 1 wherein said locking tab has a locking tab plane of weakness.
 21. The combination recited in claim 1 wherein said pour opening has substantially straight sides.
 22. The combination recited in claim 1 wherein said pour opening has arcuate sides.
 23. The combination recited in claim 1 wherein said pull tab is of the corrugated type.
 24. The combination recited in claim 1 wherein said pull tab is of the ring type.
 25. The combination recited in claim 1 wherein said pull tab is of the serrated type.
 26. The combination recited in claim 1 wherein said pull tab is of the projecting type.
 27. The combination recited in claim 1 wherein said pull tab is of the waffle type.
 28. The combination recited in claim 1 wherein said pull tab has a plurality of protuberances.
 29. The combination recited in claim 1 wherein said pull tab has a plurality of cavities.
 30. The combination recited in claim 1 wherein said can end is provided with a vent aperture and one vent closure portion of said slide or said pull tab is adapted to cover said vent aperture, said pressure barrier material being adapted to seal said vent aperture to said one vent closure portion, said one vent closure portion being operable to break said seal between said vent aperture and said one vent closure portion when said slide moves out of said entry aperture.
 31. The combination recited in claim 30 wherein said vent aperture is provided with a vent entry aperture.
 32. The combination recited in claim 31 wherein said vent entry aperture is a slot.
 33. The combination recited in claim 31 wherein said vent entry aperture is a slit.
 34. The combination recited in claim 31 wherein said vent entry aperture is provided with a vent closure portion guide means.
 35. The combination recited in claim 31 and having stop means on either said vent closure portion or said can end for preventing said vent closure portion from leaving said vent entry aperture.
 36. The combination recited in claim 30 wherein said one vent closure portion has a bulge strength measured in lbs./sq. inch equal to or greater than the bulge strength of said can end.
 37. The combination recited in claim 30 wherein said vent aperture is radial.
 38. The combination recited in claim 30 wherein said vent aperture is chordal.
 39. The combination recited in locking 30 wherein said can end has a vent aperture embossment around said vent aperture.
 40. The combination recited in claim 39 wherein said vent aperture embossment is upward.
 41. The combination recited in claim 39 wherein said vent aperture embossment is downward for vacuum seal.
 42. The combination recited in claim 30 wherein said one vent closure portion has a locking tab for engaging said can end.
 43. The combination recited in claim 30 wherein said vent aperture has substantially straight sides.
 44. The combination recited in claim 30 wherein said vent aperture has arcuate sides.
 45. The combination recited in claim 1 wherein said pull tab is of the expansion type. 